from npr news in washington, i'm lakshmi singh.
这是来自华盛顿的npr新闻，我是拉克什米·辛格。
the presidential candidates are heading into their third and final debate in what's become a tight race just weeks before the election. they will spar at lynn university in boca raton florida. this time, seated across from moderator bob schieffer of cbs, npr's ron elving says tonight's exchange is supposed to focus on foreign policy although don't be surprised if the economy comes up.
还有若干个星期，大选就要来临，
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